// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
#pragma once

#include <string>

namespace doris::cloud {

static inline std::string lexical_next(std::string_view str) {
    return std::string(str) + '\0';
}

static inline std::string lexical_end(std::string_view str) {
    std::string::size_type pos = str.find_last_not_of('\xff');
    if (pos == std::string::npos) {
        // If the string is all '\xff', we return an empty string.
        return {};
    } else {
        // Otherwise, we return the string with the last character incremented by one.
        std::string result(str.substr(0, pos + 1));
        result[pos]++;
        return result;
    }
}

} // namespace doris::cloud
